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APPLICATION ROV




                 Remotely Operated Vehicles (ROV) are state-of-the-art and precisely controllable underwa-
                 ter robots that are often operated in shifts from a vessel by an operator. They descend to
                 great depths, where they carry out repairs and manipulations on oil platforms, pipelines,
                 etc. Pressure-compensated valves are used for positioning the ROV and for the complex
                 motion sequences of the manipulation arms.




               FUNCTION
               The ROV is controlled from the mother vessel via connecting
               cables. The entire hydraulics is located on the ROV and is
               designed for high pressures at great depths. It is equipped
               with special, pressure-compensated valves for this purpose.
               The operator's control commands are transmitted as electri-
               cal signals from the water surface to the ROV at a depth of
               over 3000 m and converted by NG3-MINI valves into a pre-
               cise movement of the manipulation arms in real time. The
               manoeuvring and positioning of the robot is performed by
               thrusters, whose hydraulic motors are driven and controlled

               by large pressure valves with high volume flows.


















               COMPONENTS

               The partly high volume flows for the thruster control are con-
               trolled by large and powerful proportional pressure reducing
               valves with a nominal volume flow of up to 250 l/min (nomi-

               nal size M42). For the control of the manipulation arms, how-
               ever, the small spool valves of the NG3-MINI series are suf-

               ficient. These miniature hydraulic valves were developed as
               pilot valves as well as for special applications such as ROVs
               or sewer robot cameras and cover a niche in many areas
               of modern mechanical engineering. The advantage of these
               miniature valves is on the one hand their size and weight and
               on the other hand their low electrical power consumption,
               which is particularly important for remote-controlled or au-
               tonomous systems.





               SPECIALTIES
               •  Valves with pressure compensation
               •  Integrated on-board electronics
               •  Various connector variants or potted cables for easy installation

               •  Execution for water glycol as hydraulic fluid





               WANDFLUH MARINE        |           APPLICATION        |          ROV           |           PAGE 5
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